US20110274055A1 - Providing a serving hs-dsch cell change acknowledgement - Google Patents
Providing a serving hs-dsch cell change acknowledgement Download PDFInfo
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- US20110274055A1 US20110274055A1 US12/867,981 US86798109A US2011274055A1 US 20110274055 A1 US20110274055 A1 US 20110274055A1 US 86798109 A US86798109 A US 86798109A US 2011274055 A1 US2011274055 A1 US 2011274055A1
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- serving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
Definitions
- the present invention relates to a method and arrangement in a telecommunication system, in particular to an improved method and arrangement for a Serving HS-DSCH cell change acknowledgement.
- UTRAN Universal Mobile Telecommunications System
- UE User Equipments
- the signaling sequence for a serving HS-DSCH cell change is shown in FIG. 1 .
- the procedure is triggered by a measurement report 1 d from the UE to the Serving Radio Network Controller (SRNC), indicating that another cell in the active set has become the strongest.
- SRNC Serving Radio Network Controller
- the network receives the measurement report 1 d , the network takes the decision to change the serving cell.
- the network first configures source and target NodeBs with the new configuration and also configures the Iub transport bearer.
- both source and target NodeBs have acknowledged the configuration, the network calculates the activation time for the new configuration in case the switch to the new configuration is a synchronized procedure, meaning that UE and network shall move to the new configuration at the same time.
- the activation time is set relative to the Connection Frame Number (CFN).
- An offset is needed to cover for the time it takes to transmit the re-configuration messages to the UE and the NodeBs.
- the cell change is performed at the activation time, and a Physical Channel Reconfiguration Complete message is transmitted from the UE on the new configuration to acknowledge the procedure.
- the link quality of the source cell may degrade before the cell change procedure to the target cell is completed. If this happens before the network is able to successfully transmit the Physical Channel Reconfiguration message, the network will no longer be able to reach the UE and the call will be dropped.
- the UE When the UE sees the scheduling on HS-SCCH in the target cell, it shall interpret this as an implicit cell change command, and change configuration to that of the target cell. This includes also the Up-Link (UL), so that it starts to measure Channel Quality Indicator (CQI) from the target cell, and also adjusts the timing of the HS-DSCH (related uplink) Dedicated Physical Control Channel (HS-DPCCH) to the target cell. However the UE has to acknowledge that it received the HS-SCCH re-pointing and has moved to the target cell. In 3GPP Tdoc R2-081015, “Improving Reliability of HS-PDSCH Serving Cell Change”, two alternatives are presented.
- UL Up-Link
- CQI Channel Quality Indicator
- HS-DPCCH Dedicated Physical Control Channel
- the UE is provided two uplink scrambling codes as part of Radio Resource Control (RRC) Connection Setup or Cell Update Confirm. These scrambling codes are also provided by the RNC to Node Bs in the UE's active set. By changing the UL scrambling code, the UE indicates to the network that the Cell change procedure is completed.
- RRC Radio Resource Control
- a drawback with this solution is that it requires extra hardware in all cells in the active set to listen for the new scrambling code, while still receiving the old.
- the drawback with this solution is mainly robustness.
- the CQI is transmitted on physical layer, without support for retransmissions. Under severe imbalance situations, when the serving cell is no longer the strongest cell in the active set problems can arise. As power control regulates the transmit power to the strongest cell in the active set, imbalance may lead to the situation where the serving cell is not able to decode the UE transmission, there may thus be a need for an additional Layer 3 (L 3 ) confirmation.
- the L 3 confirmation would be a Radio Resource Control (RRC) message that has to be routed to the RNC, thus increasing the delay until it reaches the NodeB.
- RRC Radio Resource Control
- the present invention provides a procedure where a Media Access Control (MAC) frame includes information indicating the acknowledgement.
- SI Scheduling Information
- the acknowledgement could be accomplished by sending an E-DPCCH sub-frame without an accompanying E-DPDCH transmission, or by sending an E-DPDCH sub-frame without an accompanying E-DPCCH transmission, or switch the UL DPCCH slot format either temporarily or permanently.
- the invention extends also to a method in a User Equipment, a User Equipment, a method in a Node B and a NodeB for implementing the procedure as described above.
- the present invention provides more reliable and less costly means to acknowledge the serving HS-DSCH cell change command than the ones presented in for example 3GPP Tdoc R2-081015, “Improving Reliability of HS-PDSCH Serving Cell Change”.
- FIG. 1 shows the signaling procedure for serving HS-DSCH cell change
- FIG. 2 shows a signaling procedure where a serving HS-DSCH cell change acknowledgement is indicated by sending a MAC PDU
- FIG. 3 shows a signaling procedure where a serving HS-DSCH cell change acknowledgement is indicated by sending a Layer 1 acknowledgement.
- the HS-DSCH serving cell change procedure is performed as described in the background section above up to the point where the UE shall acknowledge the receipt of the HS-SCCH or S-CCCH re-pointing.
- the acknowledgement procedure is performed using an acknowledgement sent in a MAC Packet data unit (PDU) as depicted in FIG. 2 .
- PDU MAC Packet data unit
- the serving HS-DSCH cell change acknowledgement is indicated by sending a MAC PDU from the UE to the target NodeB in a step 201 containing information indicating the acknowledgement.
- SI Scheduling Information
- the serving HS-DSCH cell change acknowledgement will be covered by HARQ retransmissions as indicated by a HARQ acknowledgement in step 203 that will provide good reliability.
- the HARQ can be continued until an ACK is received by the target cell.
- the target cell receives the MAC PDU with SI, indicating HS-DSCH serving cell change acknowledgement
- the target NodeB can start scheduling data to the UE.
- the target cell informs the RNC over Iub that the cell change is completed.
- the RNC stops transmitting data to the source cell, and deletes the downlink radio links from the source cell.
- to UE can move to the target cell configuration once it receives the HARQ ACK for the MAC PDU with SI.
- the source cell can also be adapted to stop scheduling data to the UE when it receives the MAC PDU with SI indicating HS-DSCH serving cell acknowledgement.
- this may lead to data interruption in case the source cell receives the acknowledgement before the target cell.
- the measurement report 1 d can be transmitted again to trigger a new handover.
- the target cell can be adapted to schedule the UE again after a certain time from sending the initial indication on HS-SCCH as a fall-back.
- TTI Transmission Time Interval
- the serving HS-DSCH cell change acknowledgement is indicated in a Layer 1 acknowledgement as shown in step 301 in FIG. 3 .
- This can for example be achieved by transmitting the E-DPCCH without the E-DPDCH data part, or by transmitting the E-DPDCH without the E-DPCCH control part. This is not specified in the current specification, and can thus be reserved for the specific purpose of acknowledging the serving HS-DSCH cell change command on HS-SCCH in Rel-8.
- the acknowledgement can also be indicated by switching to a new slot format on UL DPCCH.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
- The present invention relates to a method and arrangement in a telecommunication system, in particular to an improved method and arrangement for a Serving HS-DSCH cell change acknowledgement.
- In UTRAN (UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access Network) systems the high-speed downlink shared channel (HS-DSCH) does not use soft handover as dedicated channels do. Instead, a procedure called serving HS-DSCH cell change is utilized to make a hard handover. Soft handover is still used for the uplink, and the active set is managed in the same way as for non-HS User Equipments (UEs).
- The signaling sequence for a serving HS-DSCH cell change is shown in
FIG. 1 . The procedure is triggered by ameasurement report 1 d from the UE to the Serving Radio Network Controller (SRNC), indicating that another cell in the active set has become the strongest. When the network receives themeasurement report 1 d, the network takes the decision to change the serving cell. To trigger a cell change, the network first configures source and target NodeBs with the new configuration and also configures the Iub transport bearer. When both source and target NodeBs have acknowledged the configuration, the network calculates the activation time for the new configuration in case the switch to the new configuration is a synchronized procedure, meaning that UE and network shall move to the new configuration at the same time. The activation time is set relative to the Connection Frame Number (CFN). An offset is needed to cover for the time it takes to transmit the re-configuration messages to the UE and the NodeBs. The cell change is performed at the activation time, and a Physical Channel Reconfiguration Complete message is transmitted from the UE on the new configuration to acknowledge the procedure. - For mobile stations travelling at very high speed, the link quality of the source cell may degrade before the cell change procedure to the target cell is completed. If this happens before the network is able to successfully transmit the Physical Channel Reconfiguration message, the network will no longer be able to reach the UE and the call will be dropped.
- Consequently, a work item 3GPP Tdoc RP-080227, “HS-DSCH Serving Cell Change Enhancements” for Release 8 (Rel-8) has been started in the Third Generation Partnership Program (3GPP) RAN2 working group to identify and specify necessary enhancements to the HS-DSCH serving cell change procedure, focusing on necessary modifications to the:
- a) Radio protocol procedures and structures
- b) Iub/Iur protocols
- c) UE, Base Station and Radio Resource Management (RRM) performance requirements
- In 3GPP Tdoc R2-081015, “Improving Reliability of HS-PDSCH Serving Cell Change”, a solution is described in which the handover procedure is altered by transmitting the re-pointing in target cell. This is made possible by pre-loading UE and NodeBs in the active set with HS related configuration. When the UE has transmitted the 1 d measurement report, it starts to monitor HS-DSCH Shared Control Channel (HS-SCCH) from both source and target cell in parallel. When the Radio Network Controller (RNC) receives the 1 d measurement report, it starts bi-casting data to source and target NodeB, and tells the target NodeB to indicate the cell change to the UE by scheduling it on HS-SCCH. When the UE sees the scheduling on HS-SCCH in the target cell, it shall interpret this as an implicit cell change command, and change configuration to that of the target cell. This includes also the Up-Link (UL), so that it starts to measure Channel Quality Indicator (CQI) from the target cell, and also adjusts the timing of the HS-DSCH (related uplink) Dedicated Physical Control Channel (HS-DPCCH) to the target cell. However the UE has to acknowledge that it received the HS-SCCH re-pointing and has moved to the target cell. In 3GPP Tdoc R2-081015, “Improving Reliability of HS-PDSCH Serving Cell Change”, two alternatives are presented.
- a) The UE is provided two uplink scrambling codes as part of Radio Resource Control (RRC) Connection Setup or Cell Update Confirm. These scrambling codes are also provided by the RNC to Node Bs in the UE's active set. By changing the UL scrambling code, the UE indicates to the network that the Cell change procedure is completed. A drawback with this solution is that it requires extra hardware in all cells in the active set to listen for the new scrambling code, while still receiving the old.
- b) By sending CQI 31, which is an unused value. The drawback with this solution is mainly robustness. The CQI is transmitted on physical layer, without support for retransmissions. Under severe imbalance situations, when the serving cell is no longer the strongest cell in the active set problems can arise. As power control regulates the transmit power to the strongest cell in the active set, imbalance may lead to the situation where the serving cell is not able to decode the UE transmission, there may thus be a need for an additional Layer 3 (L3) confirmation. The L3 confirmation would be a Radio Resource Control (RRC) message that has to be routed to the RNC, thus increasing the delay until it reaches the NodeB.
- Hence there is a need for an improved and more reliable method and arrangement that allows a user equipment to acknowledge the re-pointing over target cell in the HS-DSCH serving cell change procedure.
- It is an object of the present invention to achieve an improved and reliable method and arrangement that allows a user equipment to acknowledge the re-pointing over target cell in the HS-DSCH serving cell change procedure.
- This object and others are obtained by the method User Equipment Method and NodeB as set out in the appended claims. Briefly, the present invention provides a procedure where a Media Access Control (MAC) frame includes information indicating the acknowledgement. In one embodiment the MAC frame is containing only the Scheduling Information (SI) field with a coding not normally used, e.g. TEBS=0 and HLID!=0. Since the MAC frame is protected by Hybrid Automatic Repeat Request (HARQ), high reliability is ensured. Also, the MAC frame is transmitted to all cells in the active set, so that robustness is ensured also during imbalance situations.
- In an alternative procedure is also presented, the acknowledgement could be accomplished by sending an E-DPCCH sub-frame without an accompanying E-DPDCH transmission, or by sending an E-DPDCH sub-frame without an accompanying E-DPCCH transmission, or switch the UL DPCCH slot format either temporarily or permanently.
- The invention extends also to a method in a User Equipment, a User Equipment, a method in a Node B and a NodeB for implementing the procedure as described above.
- As an advantage, the present invention provides more reliable and less costly means to acknowledge the serving HS-DSCH cell change command than the ones presented in for example 3GPP Tdoc R2-081015, “Improving Reliability of HS-PDSCH Serving Cell Change”.
- Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
- For a better understanding, reference is made to the following drawings and preferred embodiments of the invention.
-
FIG. 1 shows the signaling procedure for serving HS-DSCH cell change, -
FIG. 2 shows a signaling procedure where a serving HS-DSCH cell change acknowledgement is indicated by sending a MAC PDU, and -
FIG. 3 shows a signaling procedure where a serving HS-DSCH cell change acknowledgement is indicated by sending aLayer 1 acknowledgement. - The present invention may, of course, be carried out in other ways than those specifically set forth herein without departing from essential characteristics of the invention. The present embodiments are to be considered in all respects as illustrative and not restrictive.
- In the below exemplary description of some embodiments the HS-DSCH serving cell change procedure is performed as described in the background section above up to the point where the UE shall acknowledge the receipt of the HS-SCCH or S-CCCH re-pointing.
- In a first embodiment the acknowledgement procedure is performed using an acknowledgement sent in a MAC Packet data unit (PDU) as depicted in
FIG. 2 . This may be referred to as a MAC acknowledgement. The serving HS-DSCH cell change acknowledgement is indicated by sending a MAC PDU from the UE to the target NodeB in astep 201 containing information indicating the acknowledgement. The indication can for example be that the MAC PDU includes Scheduling Information (SI) field with TEBS=0 and HLID!=0, or some other values not normally used. TEBS=0 and HLID!=0 is not allowed according to the 3GPP Rel-7 specification, and can thus be reserved for the specific purpose of acknowledging the serving HS-DSCH cell change command on HS-SCCH in Rel-8. As an alternative, any other coding not normally used in the current specification could be used instead of TEBS=0 and HLID!=0. - As MAC is used, the serving HS-DSCH cell change acknowledgement will be covered by HARQ retransmissions as indicated by a HARQ acknowledgement in
step 203 that will provide good reliability. To ensure the acknowledgement reaches both the source and the target cell, the HARQ can be continued until an ACK is received by the target cell. When the target cell receives the MAC PDU with SI, indicating HS-DSCH serving cell change acknowledgement, the target NodeB can start scheduling data to the UE. The target cell informs the RNC over Iub that the cell change is completed. The RNC then stops transmitting data to the source cell, and deletes the downlink radio links from the source cell. In this embodiment to UE can move to the target cell configuration once it receives the HARQ ACK for the MAC PDU with SI. - To minimize Uu load, the source cell can also be adapted to stop scheduling data to the UE when it receives the MAC PDU with SI indicating HS-DSCH serving cell acknowledgement. However, this may lead to data interruption in case the source cell receives the acknowledgement before the target cell.
- If the HARQ fails for some reason, the
measurement report 1 d can be transmitted again to trigger a new handover. - There is one error scenario for the proposed procedure that requires some attention. A NACK to ACK error will cause the UE to believe the serving HS-DSCH cell change acknowledgement was received by the target NodeB, although this is not the case. This will lead to a situation where the UE believes the cell change is successfully completed, but the NodeB still awaits the acknowledgement. In this case, the target cell can be adapted to schedule the UE again after a certain time from sending the initial indication on HS-SCCH as a fall-back.
- Furthermore, the following can be done to increase robustness:
- increase the transmit power of the HS serving cell change acknowledgement from the UE,
- increase the transmit power of the HARQ ACK from the NodeB.
- transmit only the HS serving cell change acknowledgement in a particular Transmission Time Interval (TTI). That is, no other data other than the HS serving cell change acknowledgement is transmitted in the TTI.
- In another embodiment, the serving HS-DSCH cell change acknowledgement is indicated in a
Layer 1 acknowledgement as shown instep 301 inFIG. 3 . This can for example be achieved by transmitting the E-DPCCH without the E-DPDCH data part, or by transmitting the E-DPDCH without the E-DPCCH control part. This is not specified in the current specification, and can thus be reserved for the specific purpose of acknowledging the serving HS-DSCH cell change command on HS-SCCH in Rel-8. - As an alternative, the acknowledgement can also be indicated by switching to a new slot format on UL DPCCH.
- Using the methods and User equipments as described herein will provide an improved and more robust method of generating a HS-DSCH cell change acknowledgement.
Claims (18)
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US12/867,981 US8699455B2 (en) | 2008-03-20 | 2009-01-23 | Providing a serving HS-DSCH cell change acknowledgement |
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US3821508P | 2008-03-20 | 2008-03-20 | |
PCT/SE2009/050070 WO2009116925A1 (en) | 2008-03-20 | 2009-01-23 | Providing a serving hs-dsch cell change acknowledgement |
US12/867,981 US8699455B2 (en) | 2008-03-20 | 2009-01-23 | Providing a serving HS-DSCH cell change acknowledgement |
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US8699455B2 US8699455B2 (en) | 2014-04-15 |
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US (1) | US8699455B2 (en) |
EP (1) | EP2253161B8 (en) |
JP (1) | JP5209779B2 (en) |
TW (1) | TW200944023A (en) |
WO (1) | WO2009116925A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110177816A1 (en) * | 2010-01-20 | 2011-07-21 | Research In Motion Limited | Methods of performing cell change without receiving description of resources in a target cell |
US20140241149A1 (en) * | 2013-02-27 | 2014-08-28 | Qualcomm Incorporated | Systems and methods for synchronizing wireless communication device configurations |
US20150078342A1 (en) * | 2012-05-30 | 2015-03-19 | Huawei Technologies Co., Ltd. | Method for configuring multiflow, base station, radio network controller, and user equipment |
US20150172972A1 (en) * | 2008-03-21 | 2015-06-18 | Interdigital Patent Holdings, Inc. | Method of supporting cell reselection in an evolved hspa network |
US9661543B2 (en) | 2011-02-18 | 2017-05-23 | Blackberry Limited | Cell change notification control for CSG cells |
WO2023125470A1 (en) * | 2021-12-27 | 2023-07-06 | FG Innovation Company Limited | User equipment, base station, and method for hybrid automatic repeat request (harq) control |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2288201B1 (en) * | 2009-08-18 | 2012-10-03 | Alcatel Lucent | UE measurements for hot spot detection |
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- 2009-01-23 US US12/867,981 patent/US8699455B2/en not_active Expired - Fee Related
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Cited By (9)
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US20150172972A1 (en) * | 2008-03-21 | 2015-06-18 | Interdigital Patent Holdings, Inc. | Method of supporting cell reselection in an evolved hspa network |
US20110177816A1 (en) * | 2010-01-20 | 2011-07-21 | Research In Motion Limited | Methods of performing cell change without receiving description of resources in a target cell |
US20120003975A2 (en) * | 2010-01-20 | 2012-01-05 | Research In Motion Limited | Methods of performing cell change without receiving description of resources in a target cell |
US9516559B2 (en) * | 2010-01-20 | 2016-12-06 | Blackberry Limited | Methods of performing cell change without receiving description of resources in a target cell |
US9894570B2 (en) | 2010-01-20 | 2018-02-13 | Blackberry Limited | Methods of performing cell change without receiving description of resources in a target cell |
US9661543B2 (en) | 2011-02-18 | 2017-05-23 | Blackberry Limited | Cell change notification control for CSG cells |
US20150078342A1 (en) * | 2012-05-30 | 2015-03-19 | Huawei Technologies Co., Ltd. | Method for configuring multiflow, base station, radio network controller, and user equipment |
US20140241149A1 (en) * | 2013-02-27 | 2014-08-28 | Qualcomm Incorporated | Systems and methods for synchronizing wireless communication device configurations |
WO2023125470A1 (en) * | 2021-12-27 | 2023-07-06 | FG Innovation Company Limited | User equipment, base station, and method for hybrid automatic repeat request (harq) control |
Also Published As
Publication number | Publication date |
---|---|
US8699455B2 (en) | 2014-04-15 |
EP2253161A1 (en) | 2010-11-24 |
WO2009116925A1 (en) | 2009-09-24 |
EP2253161B8 (en) | 2015-01-28 |
JP5209779B2 (en) | 2013-06-12 |
TW200944023A (en) | 2009-10-16 |
JP2011517177A (en) | 2011-05-26 |
EP2253161B1 (en) | 2014-12-17 |
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